There's not need to be running stock graphics on your Mac or PC, when you have a weekly dose of new wallpapers to pick from.

Click the dimensions (1400 x 1050 or 1440 x 900) next to each photo to open the large image in the aspect ratio that work best for your monitor. After the window pops up with the large image, you can right click to save it as your desktop image (PC), or Control-click to set it as your desktop (Mac).